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  • 1
    Keywords: Konferenzschrift
    Type of Medium: Online Resource
    Pages: XI, 423 S , Ill., graph. Darst
    Edition: Online-Ausg. Online-Ressource
    ISBN: 9781786201416
    Series Statement: Engineering geology special publication 2
    Language: Undetermined
    Note: Systemvoraussetzungen:
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 243 (1973), S. 216-217 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Burtle Clay has not been described from any surface exposure, nor has six-inch mapping of the Burtle Hill area by the Geological Survey revealed any evidence of its presence. One "borehole" 3 foot (1 m) deep at Lilac Farm (Fig. 2 of ref. 1) is shown as having penetrated the Burtle Clay beneath ...
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of engineering geology and the environment 57 (1998), S. 17-30 
    ISSN: 1435-9537
    Keywords: Key words Rock ; Strength ; UCS ; Point Load ; Testing ; Field description
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Résumé L'article discute de quelques facteurs importants qu'il faut prendre en compte lorsqu'on réalise des essais de résistance sur les roches et lorsqu'on décrit la résistance d'une roche à partir d'estimations faites pendant les études de terrain. Il met en exergue le manque de logique des catégories descriptives utilisées couramment et attire l'attention sur les écarts qui peuvent se manifester quand les roches sont testées dans des conditions différentes.
    Notes: Abstract  This paper discusses some important factors to be considered when undertaking rock strength tests and describing the strength of a rock as assessed during field investigations. It highlights the lack of consistency in the commonly used descriptive categories and draws attention to the disparencies which can arise when rocks are tested under different conditions.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of engineering geology and the environment 57 (1998), S. 113-129 
    ISSN: 1435-9537
    Keywords: Key words Landslides ; Debris flows ; Perched water ; Undrained loading ; Fluidisation ; Italy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Résumé Suite aux intenses précipitations du 4/5 mai 1998, plus d'une containe de mouvements de terrain se sont produits dans la région de Sarno-Quindici, à environ 30 km à l'est de Naples, dans le sud de l'Italic. Les mouvements de terrain sont situés dans une zone où des matériaux pyroclastiques recents recouvrent un substratum calcaire du Mésozoïque ayant déjà subi une karstification pendant une longue période. Les coulées de débris issues de ces mouvements de terrain se sont propagés sur 3 à 4 km à l'intérieur des plaines environnantes et ont atteint les villes de Sarno, Quindici, Bracigliano et Siano, en causant de graves destructions. 160 personnes ont péri. Cet article préliminaire examine plusieurs scénarios afin de mettre en lumière les causes et mécanismes possibles des mouvements de terrain. Sont particulièrement importants les scénarios des précipitations antérieures, l'éventualité de nappe d'eau perchée, les propriétés physiques des roches volcaniques métastables récentes et des paléosols sous jacents et l'influence des changements morphologiques d'origine anthropique. Des études plus poussées sont entreprises pour déterminer l'importance relative de ces différents facteurs.
    Notes: Abstract  Following intense rainfall on 4/5 May 1998, over 100 mass movements occurred in the Sarno-Quindici area, some 30 km east of Naples, southern Italy. The movements took place in an area where recent pyroclastic materials mantle a Mesozoic limestone bedrock massif which had already suffered karstification over a long period. The debris from these movements extended 3–4 km into the surrounding lowlands and reached the towns of Sarno, Quindici, Bracigliano and Siano, causing severe destruction. One hundred and sixty-one people lost their lives. This preliminary paper discusses a number of scenarios to highlight the possible causes and mechanisms of the movements. Of particular importance are preceding rainfall patterns, the possible perched water conditions, the physical properties of the recent metastable volcanoclastics and underlying palaeosols and the influence of man-made changes in the morphology. Further studies are being undertaken to elucidate the relative importance of the different contributory factors.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of engineering geology and the environment 57 (1999), S. 321-321 
    ISSN: 1435-9537
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Type of Medium: Electronic Resource
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  • 6
    Publication Date: 2014-03-26
    Description: The extremely thermoacidophilic archaeon Metallosphaera sedula (optimum growth temperature, 73°C, pH 2.0) grows chemolithoautotrophically on metal sulfides or molecular hydrogen by employing the 3-hydroxypropionate/4-hydroxybutyrate (3HP/4HB) carbon fixation cycle. This cycle adds two CO 2 molecules to acetyl coenzyme A (acetyl-CoA) to generate 4HB, which is then rearranged and cleaved to form two acetyl-CoA molecules. Previous metabolic flux analysis showed that two-thirds of central carbon precursor molecules are derived from succinyl-CoA, which is oxidized to malate and oxaloacetate. The remaining one-third is apparently derived from acetyl-CoA. As such, the steps beyond succinyl-CoA are essential for completing the carbon fixation cycle and for anapleurosis of acetyl-CoA. Here, the final four enzymes of the 3HP/4HB cycle, 4-hydroxybutyrate-CoA ligase (AMP forming) (Msed_0406), 4-hydroxybutyryl-CoA dehydratase (Msed_1321), crotonyl-CoA hydratase/( S )-3-hydroxybutyryl-CoA dehydrogenase (Msed_0399), and acetoacetyl-CoA β-ketothiolase (Msed_0656), were produced recombinantly in Escherichia coli , combined in vitro , and shown to convert 4HB to acetyl-CoA. Metabolic pathways connecting CO 2 fixation and central metabolism were examined using a gas-intensive bioreactor system in which M. sedula was grown under autotrophic (CO 2 -limited) and heterotrophic conditions. Transcriptomic analysis revealed the importance of the 3HP/4HB pathway in supplying acetyl-CoA to anabolic pathways generating intermediates in M. sedula metabolism. The results indicated that flux between the succinate and acetyl-CoA branches in the 3HP/4HB pathway is governed by 4-hydroxybutyrate-CoA ligase, possibly regulated posttranslationally by the protein acetyltransferase (Pat)/Sir2-dependent system. Taken together, this work confirms the final four steps of the 3HP/4HB pathway, thereby providing the framework for examining connections between CO 2 fixation and central metabolism in M. sedula.
    Print ISSN: 0099-2240
    Electronic ISSN: 1098-5336
    Topics: Biology
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